Normalize reST sources with best practice and KISS in mind.

to name a few points:

- simplify reST tables
- make use of ``literal`` markup for monospace rendering
- fix code-blocks for better rendering in HTML
- normalize section header markup
- limit all lines to a maximum of 79 characters
- add option -H to the sudo command used in code blocks
- drop useless indentation of lists
- ...

[1] https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.htmlSigned-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

- normalize section header markup
- limit all lines to a maximum of 79 characters
- add option -H to the sudo command used in code blocks
- place *WARNING* lines into a '.. warning::' admonition block
- make use of ``literal`` markup for monospace rendering
- drop useless indentation of lists

[1] https://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.htmlSigned-off-by: Markus Heiser <markus.heiser@darmarit.de>

docs/admin/filtron.rst:24: \
   WARNING: Could not lex literal_block as "json". Highlighting skipped.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

- add sphinx extensions
- patch documentation to make use of

These modules help to simplify the reST markup of external references.  BTW it
helps to write more readable reST and form custom brands.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

The old searx theme was a copy of the flask theme.  In the meantime this theme
is available from the python module pallets-sphinx-themes.

This patch makes pallets-sphinx-themes as a (dev) requirement and drops most of
the old and obsolete searx theme settings/files.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

BTW:
- add build & dist folder to .gitignore
- justify indentation of build messages (makefile.python)
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

User agents update

themes: remove CR from newlines

was inadvertently included in the commit [1]

[1] https://github.com/asciimoo/searx/commit/f34ac58752b3857468d01c79d7bc3409e8b03fe3#diff-0243d1c24e9981002156cc87cc10bd53R103Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

l - language field
s - search field
t - time range field

The way to activate the accesskey depends on the browser and its platform [1]

[1] https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/accesskeySigned-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

[mod] tidy oscar HTML output

RFC: Makefile based boilerplate for python projects

[fix] Update xpaths for new Google results page

Adding a CR in  some files and in others not,  is  a good starting point for a
DOS+Unix mess we all have already seen in many projects.

Patch fixes all files matching (even those comming from grunt's build)::

   find ./searx -exec file {} \; | grep CR

BTW: Same with mixing TAB and SPACE indent styles in one and the same file.  So
if sources are tuched here in this patch, its also fixed.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Add --no-cache to tell apk to not cache packages

Mojeek engine hotfix

[mod] speed optimization

[fix] duckduckgo_definitions

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Add Seedpeer again

[fix] soundcloud: URLs of JS sources has been moved

Fix this error while travis build::

  /home/travis/build/asciimoo/searx/searx/engines/duckduckgo_definitions.py:21:44: E225 missing whitespace around operator
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Do not try to get text when 'AnswerType' is 'calc'.
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

The client_id is found under (new) URL:

  https://a-v2.sndcdn.com/assets/49-a0c01933-3.jsSigned-off-by: Markus Heiser <markus.heiser@darmarit.de>

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

[fix] mojeek engine

Fix python 3.8 compatibility